The NEC B58944 is a specific semiconductor component, typically a power transistor or voltage regulator, often found in specialized industrial equipment or legacy power supply modules. Finding a detailed datasheet for this specific part number can be challenging because it is frequently listed as an OEM-specific part or an older discontinued series.
NEC D43256BGU-70Y (often labelled as B58944 on the board). Function: Fast CMOS Static RAM (SRAM). Capacity: 256 K-bits (32 KiloBytes). Package: SOP-28 / TSOP-28 (Surface Mount). Access Time: 70 ns (indicated by -70Y). Usage: Automotive Engine Computer Boards (ECU). 2. Why is the NEC B58944 Chip Getting "Hot"?
is a surface-mount integrated circuit primarily used in Bosch automotive ECUs, including EDC16, ME7.4.4, and other modules. If you search for "nec b58944 datasheet hot," you need this guide.
The NEC B58944, often identified as the , is a critical, yet frequently failing, 256k-bit static RAM (SRAM) integrated circuit found within many Bosch automotive Engine Control Units (ECUs) . Used in various vehicles, this chip serves as temporary memory for engine operational data, driving patterns, and diagnostic codes. nec b58944 datasheet hot
Note: Replacement components sourced from distributors are typically shipped as blank chips without software. Since this component serves as volatile SRAM memory rather than read-only firmware memory, it does not require pre-programming prior to installation. The primary microprocessor initializes and writes data to the chip automatically upon the next ignition key cycle.
The is a critical, high-reliability component found in older BOSCH automotive ECUs. A hot NEC B58944 is almost always a sign of a critical failure within the driver circuit or an external component short. Proper troubleshooting of the entire actuator circuit is mandatory before replacing this IC to avoid immediate failure of the new component.
Note: This is an "empty" chip, meaning it usually does not require programming for standard SRAM functionality, but it must match the original specs, particularly the 70ns speed. 5. Finding the Datasheet and Replacements The NEC B58944 is a specific semiconductor component,
Q: What package is the NEC B58944 available in? A: The NEC B58944 is available in a 7-lead TO-263 package.
(Engine Control Units). In the automotive repair community, it is notorious for being a high-failure component that often runs "hot" due to electrical stress or circuit board damage. Technical Overview Primary Function : Automotive engine drive chip/ECU computer IC. Package Type (Small Outline Package with 28 pins). Manufacturer : NEC Corporation (now part of Renesas Electronics
Its function within these systems is often critical. In the case of the B58944 D43256BGU-70Y marking, it is specifically listed as a on Bosch vehicle computer boards. From the table, the High-Side Driver variant is the most common type in this application, switching power to various loads such as actuators or sensors, and connecting the OBD-II port to the vehicle's communication network. This explains why a failed chip can result in a "no communication" error with diagnostic tools. Function: Fast CMOS Static RAM (SRAM)
Okay, I have analyzed the request "content: nec b58944 datasheet hot". Here is the information I found regarding the NEC B58944.
: Found in Honda, Iveco, and Volvo ECUs, including Bosch models ME7.4.4, ME7.5, and EDC16. Thermal Issues ("Hot") & Failure